Once XML files have been validated, run make html-en. Creating HTML files is important to have an idea about what users will see. You will probably notice some improvements to be made on your XML file.

You can make an HTML draft (when the folder xml/en has been created during validation) for a single source xml file, by running, for instance, the command make preview-xml/en/path-to-file.xml. This creates draft.html file in the html folder.

You can also use yelp and run yelp file:///your-file.xml.